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Generating sitemap.xml

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sitemap lib ex_sitemap_generator blank.ex
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lib/ex_sitemap_generator/blank.ex 

defprotocol Blank do

  @fallback_to_any true

  def blank?(data)

end



defimpl Blank, for: Integer do

  def blank?(_),     do: false

end



defimpl Blank, for: String do

  def blank?(''),    do: true

  def blank?(_),     do: false

end



defimpl Blank, for: BitString do

  def blank?(""),    do: true

  def blank?(_),     do: false

end



defimpl Blank, for: List do

  def blank?([]),    do: true

  def blank?(_),     do: false

end



defimpl Blank, for: Tuple do

  def blank?({}),    do: true

  def blank?(_),     do: false

end



defimpl Blank, for: Map do

  def blank?(%{}),   do: true

  def blank?(_),     do: false

end



defimpl Blank, for: Atom do

  def blank?(false), do: true

  def blank?(nil),   do: true

  def blank?(_),     do: false

end



# defimpl Blank, for: Ecto.Date do

  # def blank?(%Ecto.Date{year: 0, month: 0, day: 0}), do: true

  # def blank?(%Ecto.Date{year: 1, month: 1, day: 1}), do: true

  # def blank?(_),  do: false

# end



defimpl Blank, for: Any do

  def blank?(_),     do: false

end